NOAO >   Observing Info >   Approved Programs >   2003B-0147

Small NOAO Logo

Proposal Information for 2003B-0147


PI: B. R. Oppenheimer, American Museum of Natural History, bro@amnh.org
Address: Department of Astrophysics, 79th Street @ Central Park West, New York, NY 10024-5192, USA

CoI: F. J. Clarke, European Southern Observatory/Chile
CoI: S. T. Hodgkin, Institute of Astronomy, Cambridge, UK
CoI: C. G. Tinney, Anglo-Australian Observatory, Australia

Title: The nature of the L/T transition; variability in cool brown dwarfs

Abstract: We propose to monitor a statistically significant sample of L/T type brown dwarfs to determine levels of variability due to dynamic atmospheric processes such as dust cloud formation and destruction. Understanding the behavior of dust clouds is critical to our overall understanding of this class of brown dwarfs. Recent observations and models suggest that the transition from L to T may be due to the rapid evolution of dust clouds. Such models also imply significant levels of variability. In coordinated proposals, we will make a definitive study of this variability on baselines of up to 15 hours, significantly building on our previous work. The large size of our sample is critical to obtain a true measure of variability levels in the L/T brown dwarf population, and will permit us to verify or refute the models of the L/T transition in brown dwarfs.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2003B-0147

noaoprop-help@noao.edu

Small NOAO Logo